transition element(One of a group of metallic elements in which the members have the filling of the outermost shell to 8 electrons interrupted to bring the penultimate shell from 8 to 18 or 32 electrons; includes elements 21 through 29 (scandium through copper), 39 through 47 (yttrium through silver), 57 through 79 (lanthanum through gold), and all known elements from 89 (actinium) on)
transitional arrangement(Rules, guidelines or an agreement on the process of changing the administration, structure or constitution of a government or organization)
transitional settlement(A small village, community or group of houses, or other shelters, usually located in a thinly populated area and existing there for only a short time)